Forces UIImage to load and decode its data

UIImage+ForceLoad.m

@implementation UIImage (ForceLoading)

- (void) forceLoad
{
    const CGImageRef cgImage = [self CGImage];  

    const int width = CGImageGetWidth(cgImage);
    const int height = CGImageGetHeight(cgImage);
    
    const CGColorSpaceRef colorspace = CGImageGetColorSpace(cgImage);
    const CGContextRef context = CGBitmapContextCreate(
        NULL, /* Where to store the data. NULL = don’t care */
        width, height, /* width & height */
        8, width * 4, /* bits per component, bytes per row */
        colorspace, kCGImageAlphaNoneSkipFirst);

    CGContextDrawImage(context, CGRectMake(0, 0, width, height), cgImage);
    CGContextRelease(context);
}

@end

didn't work for me today on iOS 10: if I have a UIImage, call this, retain the image somewhere, then immediately it from disk, i cannot use it properly anymore (it appears garbled). If I don't delete it, it's fine.